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91. 发明专利

JPH0379623B2 失效
公开(公告)号：JPH0379623B2
公开(公告)日：1991-12-19
申请号：JP3061882
申请日：1982-03-01
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAJIWARA HIROTAKE , KAWAMURA SHIGETO , KURITA YOSHIHISA
IPC分类号： H01F6/04 , F25B9/00 , F25B9/02 , H01F6/00 , H01L39/04

92. 发明专利

JPH03267660A HELIUM COMPRESSOR 失效
公开(公告)号：JPH03267660A
公开(公告)日：1991-11-28
申请号：JP6420590
申请日：1990-03-16
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MATSUMOTO KOZO
IPC分类号： F25B9/00 , F25B43/02
摘要： PURPOSE:To enable stable and good operation for a long time by providing a solving tank for solving oil in an oil removing system of a helium compressor and an absorbing tank for absorbing solvent at the rear stage of the solving tank. CONSTITUTION:Helium gas out of a separater 2 is cooled by a cooler 3 and oil contained in the gas is removed by a compressor 4 and an absorbing tank 5. The helium gas containing little amont of oil in it is led into a solving tank 11 which contains solvent 10 such as chlorofluoro carbon, trichloroethane, carbon tetrachloride or the like, and the oil contained in the helium gas is completely removed. The helium gas accompanied with solvent mist is further led into the compressor 4 and the absorbing tank 5, where the solvent is removed from the helium gas. Thus completely oil removed helium gas enters a cold box 21, where it is heat exchanged and cooled by a return helium gas. If the solvent mist enters the cold box 21 together with the helium gas, the solvent is absorbed and removed in a low temperature absorbing tank.

93. 发明专利

JPH03148567A REFRIGERATOR 失效
公开(公告)号：JPH03148567A
公开(公告)日：1991-06-25
申请号：JP28522989
申请日：1989-11-01
申请人： HITACHI LTD
发明人： SAHO NORIHIDE , NEMOTO TAKEO , OGATA HISANAO , HARADA SUSUMU , MATSUMOTO KOZO , TAKIZAWA TERUHIRO
IPC分类号： F25B9/00 , F25B9/02 , F25B9/10
摘要： PURPOSE:To enhance a heat-exchanging efficiency in heat exchangers and reduce the freezing rate of an expanding device in a refrigerator by providing the cold heat accumulator type heat exchangers on the way of flow passages of a work fluid. CONSTITUTION:Cold heat accumulator type heat exchangers 11, 12 are provided on the way of flow passages of a work fluid. The cold heat accumulator type heat exchangers 11, 12 are heat exchangers for exchanging heat by a method wherein heat storage materials i.e. rare earth metals such as copper, aluminum, phosphor bronze, lead and gadolinium, or their compounds, are formed into a netting shape or into a granular state to be filled in containers into which a gas helium having a high-temperature and a high-pressure and a gas helium having a low-temperature and a high-pressure are allowed to flow in a counter- direction while changing the over alternately at a certain period with the aid of change-over means 7a, 7b, 8a, 8b. The temperature efficiency of the heat exchangers 11, 12 can be enhanced up to a level near 0.99 by optimizing the period of changing over the gases. Thereby, the required amount of cold generation of an expanding device 1 can be reduced, and the operational power for the expanding device 1 can sufficiently be minimized.

94. 发明专利

JPH03105161A CRYOGENIC FREEZING METHOD AND FREEZING DEVICE 失效
公开(公告)号：JPH03105161A
公开(公告)日：1991-05-01
申请号：JP24224089
申请日：1989-09-20
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAWAMURA SHIGETO
IPC分类号： F25B9/00 , F25B9/02
摘要： PURPOSE:To provide a freezing system having a high efficiency by a method wherein a compression ratio of a compressor for use in compressing a refrigerant gas fed into an ultra-low temperature freezer provided with an expansion device is varied in response to an operating condition of the ultra-low temperature freezer. CONSTITUTION:High pressure gas compressed by a multi-stage compressor 10 flows through a discharging line 40 and is fed into an ultra-low freezing device 20. Just after starting an operation, since a part of the device is kept at a normal temperature level, resulting in that the ultra-low temperature freezing device 20 does not require any high expansion ratio. Due to this fact, at the beginning, only n-th stage compressor 11n of the multi-stage compressor 10, for example, is kept at its operating condition and only a suction line changing-over valve 50n is opened. After this operation, a pre-cooling of the ultra-low temperature freezer 20 is progressed and a required compression ratio is increased, and each of the compression stages 11m to 11a is set to operate in sequency. In correspondence with it, an opened suction line changing-over valve is also changed over in sequence to 50m to 50a. In this way, the suction line for the multi-stage compressor is changed over in correspondence with an expansion ratio required in the ultra-low temperature freezing device so as to change a compression ratio, so that it is possible to construct the freezing system having a high efficiency.

95. 发明专利

JPH01269875A LIQUEFACTION CONTROL METHOD AND DEVICE FOR LIQUEFYING AND REFRIGERATING EQUIPMENT 失效
公开(公告)号：JPH01269875A
公开(公告)日：1989-10-27
申请号：JP9815488
申请日：1988-04-22
申请人： HITACHI LTD
发明人： KAWAMURA SHIGETO , MATSUMOTO KOZO , YOSHIDA JUN
IPC分类号： F25B9/02 , F25B9/06 , F25J1/02
摘要： PURPOSE:To permit the efficient operation of a liquefying and refrigerating device including precooling stage, by controlling the opening degree of an expansion valve by a pressure and a temperature at the upstream side of the expansion valve. CONSTITUTION:Helium gas, compressed by a compressor 1, enters into a cold box 2 and effects heat exchange between returned helium gas in heat exchangers 3a-3c. Other gas in a high-pressure line arrives at a cryogenic condition by the heat exchangers 3a-3c, effects entropy expansion in an expansion turbine 6 through an inlet valve 5, effects further enthalpy expansion in an expansion valve 7 into misty condition and, then, is sent into a cooled body 10 through a low temperature transfer pipe 8. An expansion valve control means 17 inputs a temperature and a pressure in the downstream of the expansion turbine 8 through a pressure meter 14 and a thermometer 15, operates a comparison between the inputted measuring value and a set value and when either one of said measuring data is lower than the set value, the expansion valve control means controls the expansion valve 7 into choking direction so that a pressure in the outlet side of the expansion turbine 6 becomes higher than the suction pressure of the compressor 1 and a temperature at the outlet side of the same becomes higher than a critical temperature.

96. 发明专利

JPH01266832A ADSORPTION DEVICE 失效
公开(公告)号：JPH01266832A
公开(公告)日：1989-10-24
申请号：JP9558788
申请日：1988-04-20
申请人： HITACHI LTD , HITACHI TECHNO ENG
发明人： FUJIMORI KANJI , MATSUMOTO KOZO , KAJIWARA HIROTAKE
IPC分类号： B01D53/04
摘要： PURPOSE:To reduce the regenerating time by providing an adsorption tower having spaces above and below the adsorbent, a heat exchanger arranged in the upper space, a means for circulating the gas in the lower space through the heat exchanger, and a heating means set in the adsorbent. CONSTITUTION:The adsorbent 2 is placed in the adsorption tower 1, and the upper space 3 and the lower space 4 are formed above and below the adsorbent 2. When the adsorbent is regenerated, the adsorbent is heated by the heater 5 in the adsorbent 2, and the heated gas is accumulated in the upper space by convection. In this case, a fan 7 is driven to send the gas staying cold in the lower space 4 to the heat exchanger 6 in the upper space 3, the heated gas is returned to the lower space 4, and the temp. distribution in the adsorption tower 1 is uniformized.

97. 发明专利

JPH0147711B2 失效
公开(公告)号：JPH0147711B2
公开(公告)日：1989-10-16
申请号：JP17320682
申请日：1982-10-04
申请人： HITACHI LTD
发明人： MATSUMOTO KOZO , KAWAMURA SHIGETO
IPC分类号： F25B9/00 , F04B37/08

98. 发明专利

JPH01237303A EXPANSION TURBINE DEVICE 失效
公开(公告)号：JPH01237303A
公开(公告)日：1989-09-21
申请号：JP5830988
申请日：1988-03-14
申请人： HITACHI LTD
发明人： OKAMOTO KAZUO , MATSUMOTO KOZO
IPC分类号： F01D1/16 , F01D1/18 , F01D25/16 , F25B9/06
摘要： PURPOSE:To enlarge braking range of a brake fan in a turbine provided with a rotary body having a rotor and the brake fan at both ends of a rotary shaft by disposing a cooler for cooling discharged gas from the brake fan so as to adjust flow rate of the gas. CONSTITUTION:In an expansion turbine 10, a rotary shaft 11 having a brake fan 13 on its upper end and a rotor 12 on its lower end is rotatably supported inside a case 18 through a gas bearing 19. Another case 14 is attached to the case 18 on the rotor 12 side, and inside the case 14, there are provided a nozzle 16 on the periphery of the rotor 12 and an outlet pipe 17 on the discharge side of the rotor 12. In this case, on the brake fan 13 side, there is provided a cooler 30 using cooling water as a refrigerant, where many heat exchanger tubes 35 are inserted through a space between inner and outer cylinders 31 and 32, and further, an introducing pipe 22 for surrounding the brake fan 13 is disposed so as to be intercommunicated with the hollow portion of the inner cylinder 31. In addition, a brake valve 40 is provided at the end of the cooler 30 on an anti brake fan side, thereby adjusting flow rate of gas.

99. 发明专利

JPH01159567A CRYOGENIC LIQUEFYING REFRIGERATOR 失效
公开(公告)号：JPH01159567A
公开(公告)日：1989-06-22
申请号：JP31628487
申请日：1987-12-16
申请人： JAPAN ATOMIC ENERGY RES INST , HITACHI LTD
发明人： SHIBANUMA KIYOSHI , SHIBATA TAKEYORI , KAJIWARA HIROTAKE , MATSUMOTO KOZO
IPC分类号： F25B9/02
摘要： PURPOSE: To facilitate operation by providing a bypass line for returning the gas from an object to be cooled back to the suction side of a reducing pump during operation thereof while bypassing a heat exchanger at the time of preheating. CONSTITUTION: Valves 47a, 47b are opened while a valve 71 is closed upon starting a reducing pump 20. Return gas from an object 50 flowing through an object 50 to be cooled is thereby fed through a reducing line 34 and a bypass line 70 to a first heat exchanger 41a where the temperature is recovered before the gas is returned back to the suction side of the pump 20 through the line 34. When the temperature of the object 50 is lowered down to a steady temperature, e.g. 4.5 K, precooling operation is finished and a transition is made to steady operation. Since the effect of temperature rise of heat exchangers 41a-41e due to the gas being returned from the object 50 back to the pump 20 during operation thereof can be suppressed at the time of preheating the object 50, trial and error operation of the pump 20 can be eliminated at the time of precooling.

100. 发明专利

JPH01150755A METHOD OF CONTROLLING OPERATION OF CRYOGENIC REFRIGERATOR 失效
公开(公告)号：JPH01150755A
公开(公告)日：1989-06-13
申请号：JP30753387
申请日：1987-12-07
申请人： JAPAN ATOMIC ENERGY RES INST , HITACHI LTD
发明人： SHIBANUMA KIYOSHI , SHIBATA TAKEYORI , MURAKAMI SEI , SASAKI KIYOSHI , MATSUMOTO KOZO
IPC分类号： F25B9/02 , F25B9/00 , F25B9/06
摘要： PURPOSE: To properly maintain the travel of an inlet valve of an expansion device throughout pre-cooling and stable operations in a cryogenic freezer by selecting the minimum of travels of an expansion device inlet valve obtained from controlled variables of temperature and pressure at the inlet and outlet of the expansion device to operate the valve. CONSTITUTION: An expansion turbine inlet valve 70 that is the expansion device inlet valve is, in this case, controlled on a basis of control variables, that is, inlet pressure P1 of a first expansion turbine 40 detected by a pressure detector 80, inlet pressure P2 of a second expansion turbine 41 detected by a pressure detector 81 and inlet temperature T1 of the second expansion turbine 41 detected by a temperature detector 82. In the case of employing the inlet pressure P2 of the second expansion turbine 41 for the controlled variable, the expansion turbine inlet valve 70 is excessively opened during the last half period of the pre-cooling operation and the stable operation to lower the inlet temperature of the second expansion turbine 41. Therefore, the travel of the expansion turbine inlet valve 70 can be properly maintained throughout the pre-cooling and stable operations by selecting the minimum of control inputs obtained from these controlled variables or the travels of the expansion turbine inlet valve 70 for the actual control input.

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